Apparatus for a vehicle for dumping and providing ground access

ABSTRACT

An apparatus generally includes a dump frame pivotably coupled to a vehicle&#39;s chassis, and a slide frame slidably coupled to the dump frame. The apparatus further includes at least one slide frame actuator for causing sliding movement of the slide frame, and at least one dump frame actuator for causing pivotal movement of the dump frame.

CROSS-REFERENCE TO RELATED APPLICATION

The application is a divisional of U.S. patent application Ser. No.11/149,344 filed Jun. 9, 2005 (now U.S. Pat. No. 7,401,860, issued Jul.22, 2008), the disclosure of which is incorporated herein by referencein its entirety.

FIELD OF THE INVENTION

The present invention generally relates to apparatus for a vehicle fordumping and providing ground access, such as a bed of a pickup truck.

BACKGROUND OF THE INVENTION

The statements in this section merely provide background informationrelated to the present disclosure and may not constitute prior art.

People commonly transport heavy loads within the bed of a pickup truck.Depending on the load (e.g., riding lawn mower, four wheel all-terrainvehicle, motorcycle, etc.), it may be necessary to back the truck up toa platform at an elevation approximately equal to that of the bed inorder to slide or roll the load onto/off of the bed. As an alternative,the load may be slid or rolled onto a ramp positioned between the groundand the bed during loading or unloading. In addition, sand, gravel,dirt, and rock are commonly hauled in a pickup truck bed. And, althoughsome designs may permit limited tilting of the bed to facilitateunloading, such designs are usually limited to low tilt angles that arenot sufficient for dumping. In which case, the load must still beshoveled or otherwise pushed off the tilted bed.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, an apparatus generallyincludes a dump frame pivotably coupled to a vehicle's chassis forpivotal movement relative to the chassis. The apparatus also includes aslide frame for supporting a load. The slide frame is slidably coupledto the dump frame such that the slide frame is longitudinally slidablerelative to the dump frame, and such that the slide frame pivots alongwith the dump frame relative to the chassis. The apparatus furtherincludes at least one slide frame actuator for causing sliding movementof the slide frame, and at least one dump frame actuator for causingpivotal movement of the dump frame.

According to another aspect of the present invention, an apparatusgenerally includes a dump frame pivotably coupled to a vehicle's chassisfor pivotal movement relative to the chassis. The apparatus alsoincludes a slide frame for supporting a load. The slide frame isslidably coupled to the dump frame such that the slide frame islongitudinally slidable relative to the dump frame, and such that theslide frame pivots along with the dump frame relative to the chassis.The apparatus further includes at least one seal for substantiallysealing at least one sliding surface to thereby inhibit the ingress offoreign objects and debris to the sliding surface.

Further aspects and features of the present invention will becomeapparent from the detailed description provided hereinafter. It shouldbe understood that the detailed description and specific examples, whileindicating exemplary embodiments of the invention, are intended forpurposes of illustration only and are not intended to limit the scope ofthe invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from thedetailed description and the accompanying drawings, wherein:

FIG. 1 is a perspective view of a truck having an apparatus for dumpingand providing ground access according to one exemplary embodiment of theinvention, and illustrating the apparatus in an intermediate load/dumpposition;

FIG. 2 is a front view of the truck shown in FIG. 1 with the cab removedfor clarity;

FIG. 3 is a side view of the truck shown in FIG. 1 and illustrating theapparatus in a transport position;

FIG. 4 is a side view of the truck shown in FIG. 1 and illustrating theapparatus in an intermediate dump position;

FIG. 5 is a side view of the truck shown in FIG. 1 and illustrating theapparatus in a dump position;

FIG. 6 is a side view of the truck shown in FIG. 1 and illustrating theapparatus in a slidably extended position;

FIG. 7 is a side view of the truck shown in FIG. 1 and illustrating theapparatus in an intermediate load/dump position;

FIG. 8 is a side view of the truck shown in FIG. 1 and illustrating theapparatus in a load position;

FIG. 9 is a top view of the truck shown in FIG. 1 and illustrating theapparatus in a transport position;

FIG. 10 is a top view of the truck shown in FIG. 1 and illustrating theapparatus in a slidably extended position;

FIG. 11 is a side view of the truck shown in FIG. 1 wherein the truckincludes a bed shown in the transport position;

FIG. 12 is a side view of the truck shown in FIG. 11 and illustratingthe bed in an intermediate dump position;

FIG. 13 is a side view of the truck shown in FIG. 11 and illustratingthe bed in a dump position;

FIG. 14 is a side view of the truck shown in FIG. 11 and illustratingthe bed in a slidably extended position;

FIG. 15 is a side view of the truck shown in FIG. 11 and illustratingthe bed in an intermediate load/dump position;

FIG. 16 is a side view of the truck shown in FIG. 11 and illustratingthe bed in a load position;

FIG. 17 is a top view of the truck shown in FIG. 11 an illustrating thebed in a transport position;

FIG. 18 is a top view of the truck shown in FIG. 11 and illustrating thebed in a slidably extended position;

FIG. 19 is rear view of the truck shown in FIG. 11 and illustrating thebed in a transport portion;

FIG. 20 is a rear transverse cross-sectional view of the truck shown inFIG. 11;

FIG. 21 is a rear transverse cross-sectional view of a portion of thetruck as shown in FIG. 20;

FIG. 22 is a rear transverse cross-sectional view of a portion of FIG.21;

FIG. 23 is a side view of a truck having a bed (with one side railremoved for clarity), a bed-mounted winch, and an apparatus for dumpingand providing ground access according to one exemplary embodiment of theinvention, and illustrating the apparatus and bed in a load position;

FIGS. 24A and 24B are side views of the truck shown in FIG. 11illustrating an exemplary manner by which the bed can be removed fromand attached to the dump/slide apparatus;

FIG. 25 is a top view of a truck having an apparatus for dumping andproviding ground access that includes a scissors hoist according toanother exemplary embodiment of the invention, and illustrating theapparatus in a transport position;

FIG. 26 is a top view of the truck shown in FIG. 25 and illustrating theapparatus in a slidably extended position;

FIG. 27 is a side view of the truck shown in FIG. 25 wherein the truckincludes a bed shown in the transport position;

FIG. 28 is a side view of the truck shown in FIG. 27 and illustratingthe bed in an intermediate dump position;

FIG. 29 is a side view of the truck shown in FIG. 27 and illustratingthe bed in a dump position;

FIG. 30 is a side view of the truck shown in FIG. 27 and illustratingthe bed in a load position;

FIG. 31 is a transverse cross-sectional view of a portion of anapparatus for dumping and providing ground access according to anotherexemplary embodiment of the invention in which the apparatus includes atleast one seal for substantially sealing an interface between the slideframe and the dump frame;

FIG. 32 is a transverse cross-sectional view of a portion of anapparatus for dumping and providing ground access according to anotherexemplary embodiment of the invention in which a top portion of theslide frame extends across a portion of the dump frame therebysubstantially sealing an interface between the slide frame and the dumpframe;

FIG. 33 is a top view of a truck having an apparatus for dumping andproviding ground access according to another exemplary embodiment of theinvention in which the dump frame actuator is located within the widthof the chassis, but the slide frame actuators are located outside thewidth of the chassis;

FIG. 34 illustrates transverse cross-sectional shapes that can be usedfor the dump frame longitudinal members and slide frame longitudinalmembers in another embodiment of an apparatus for dumping and providingground access;

FIG. 35 illustrates transverse cross-sectional shapes that can be usedfor the dump frame longitudinal members and slide frame longitudinalmembers in another embodiment of an apparatus for dumping and providingground access;

FIG. 36 is a perspective view of a truck having an apparatus for dumpingand providing ground access according to another embodiment of theinvention, and illustrating the apparatus in an intermediate load/dumpposition; and

FIG. 37 is a front view of the truck shown in FIG. 36 with the cabremoved for clarity.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following description of various embodiments is merely exemplary innature and is in no way intended to limit the invention, itsapplications, or uses.

FIGS. 1 through 10 illustrate one embodiment of an apparatus 100 thatcan be used with a vehicle 102 for dumping and providing ground access.While the illustrated embodiments depict the apparatus 100 being usedwith a pickup truck, aspects of the invention are not so limited. Thedesign of the apparatus 100 is efficient enough (e.g., compact,relatively light weight, etc.) to be used on a vehicle as small as apickup truck, but embodiments could also be relatively easily adapted tofit a larger truck or trailer. Indeed, aspects of the present inventioncan be applied to a wide range of vehicles, including pickup trucks,other larger commercial-type trucks, trailers, and other vehicles havinga chassis to which can be attached load-carrying apparatus (e.g.,load-carrying platforms and beds, etc.). Accordingly, the specificreferences to trucks herein should not be construed as limiting thescope of the present invention to any specific form/type of vehicle.

With continued reference to FIGS. 1 through 10, the apparatus 100includes a dump frame 104 pivotably coupled to the truck's chassis 106.As shown by comparing FIGS. 3 and 4, the dump frame 104 is pivotalrelative to the chassis 106. The apparatus 100 also includes a slideframe 108 slidably coupled to the dump frame 104. As shown by comparingFIGS. 3 and 6, the slide frame 108 is longitudinally slidable relativeto the dump frame 104. The slide frame 108 pivots along with the dumpframe 104 relative to the chassis 106, as shown in FIG. 4.

With further reference to FIG. 9, the dump frame 104 is generallyrectangular in shape. The dump frame 104 includes a pair of longitudinalmembers 110, a front cross member 112, and an intermediate cross member114. Each longitudinal member 110 has a front end portion 116 adjacentthe truck's cab 118, and a rear end portion 120 disposed aft of thetruck's rear wheels 122, spare tire 124, and mud flaps 126. The frontcross member 112 extends transversely between the front end portions116. The intermediate cross member 114 also extends transversely betweenthe longitudinal members 110 but at a position aft of the front crossmember 112. Having the front cross member 112 disposed between the frontend portions 116 enhances rigidity of the dump frame 104. This can beadvantageous, for example, when the force for causing pivotal movementof the dump frame 104 is applied at a single location. In otherembodiments, the front cross member 112 is not necessarily required andcan be eliminated, for example, when the load for causing pivotalmovement of the dump frame is more evenly distributed along a widthdefined between the longitudinal dump frame members 110.

As shown in FIGS. 1 through 4, the apparatus 100 further includes atleast one dump frame actuator 128 for causing pivotal movement of thedump frame 104 relative to the chassis 106. In the illustratedembodiment, the dump frame actuator 128 includes a telescoping hydrauliccylinder. In other embodiments, however, the dump frame actuator 128 canbe a pneumatic actuator, an electrically-operated actuator,non-cylindrical actuators, among other suitable actuation devices. Forexample, and as described below, FIGS. 25 through 30 illustrate anotherembodiment of an apparatus 300 in which the actuation power for causingthe pivotal movement is provided by a dump frame actuator 328 coupled toa linkage 394 also commonly referred to as a scissors. The combinationof a dump frame actuator and scissors is commonly referred to as ascissors hoist. In the illustrated embodiment, the dump frame actuator328 is directly connected to the scissors 394. Alternatively, otherembodiments include a dump frame actuator that is not directly connectedto the scissors. In such alternative embodiments, the dump frameactuator is instead connected to the dump frame at one location, withthe scissors being connected to the dump frame at a different locationthan the dump frame actuator.

While only one dump frame actuator 128 is shown in the FIGS. 1 through4, alternative embodiments include a plurality of dump frame actuatorsthat cooperate to provide the actuation power for pivotably moving thedump frame relative to the chassis. In addition, the hoses forconnecting the dump frame actuator 128 to its power source have beenremoved for clarity.

In various embodiments, the dump frame actuator 128 receives power froma hydraulic pump mounted on the vehicle's engine. In another embodiment,the dump frame actuator 128 receives its power from a self-containedstandalone electrically driven hydraulic power unit, which may, forexample, be contained within the space (generally indicated by arrow 129in FIG. 1) defined by the vehicle's chassis 106 or at other suitablelocations. Alternatively, other suitable means can be employed forproviding power to the dump frame actuator 128. For example, the dumpframe actuator 128 may receive hydraulic power generated by a hydraulicpump driven off of the truck's transmission. Or, for example, a widerange of non-hydraulic power sources (e.g., electric motors incombination with gear drives, screw drives, cables and pulleys, chainsand sprockets, etc.) may be used for causing the dumping pivotalmovement.

As shown in FIGS. 2 and 3, the dump frame actuator 128 is a hydrauliccylinder with a first end 130 pivotably mounted to a bracket 132 of across member of the truck chassis 106. In various embodiments, theapparatus 100 may be retrofit onto an existing vehicle in which case thebracket 132 may be an integral part of an replacement cross member thatis coupled to the vehicle chassis after removing an existing crossmember.

The dump frame actuator 128 also includes a second end 134 pivotablymounted to the cross member 114 of the dump frame 104. In theillustrated embodiment, the first end 130 generally refers to the baseend of the hydraulic cylinder 128. The second end 134 generally refersto the end of the shaft or rod, which, in turn, is engaged with a piston(not shown) within the hydraulic cylinder 128. In other embodiments,however, the first and second ends 130 and 134 may be reversed such thatthe base end of the actuator cylinder is pivotably mounted to the crossmember 114, and the rod end is pivotably mounted to the truck chassis106. Alternatively, other types of actuators (e.g., non-hydraulicactuators, pneumatic actuators, electrical actuators, non-cylindricalactuators, telescoping actuators, etc.) can also be employed with theirfirst and second ends respectively coupled to the cross member 114 andthe chassis 106, or vice versa.

During operation, the dump frame actuator 128 provides the actuationpower for causing pivotal movement of the dump frame 104 relative to thechassis 106, or more specifically, about pivots 136. In the illustratedembodiment of FIG. 4, each pivot 136 includes a hinge mounted to one ofthe longitudinal members 110 and a rear end portion of the truck chassis106.

The pivotal movement of the dump frame 104 creates an angle A (FIG. 5)defined generally between the dump frame 104 and the chassis 106. Invarious embodiments, the apparatus 100 is configured to be pivotable toan angle A that exceeds ninety degrees from the transport position (thetransport position is shown in FIG. 3). Generally, the angle A should beat least about thirty-five degrees to be considered a sufficient anglefor dumping operations.

The dump frame 104 and dump frame actuator 128 are located within thewidth of the chassis 106. Alternatively, however, either or both of thedump frame 104 and/or dump frame actuator 128 can be located outside thewidth of the chassis 106.

As shown in FIG. 21, the second end 134 of the dump frame actuator 128is vertically disposed at least partially within the height definedbetween the dump frame's top and bottom surfaces 138 and 140. This helpskeep the apparatus 100 relatively compact with a relatively low profile.

As best shown in FIG. 9, the cross member 114 is closer to the front endportions 116 of the longitudinal members 110 than the rear end portions120. Having the middle cross member 114 (to which the dump frameactuator 128 applies the pivoting force) closer to the front of the dumpframe 104 advantageously creates a longer moment arm relative to thepivots 136, thereby allowing the apparatus 100 to be pivoted with lessapplied force. But this more forward positioning of the middle crossmember 114 also reduces the available space for the dump frame actuator128 and increases its required stroke length. Accordingly, the inventorhereof has recognized that positioning of the middle cross member 112involves a tradeoff between actuator size/stroke length and the momentarm length. In the illustrated embodiment, the reduced availablespace/stroke length for the actuator 128 resulting from the more forwardpositioning of the middle cross member 114 is mitigated (at least inpart) by positioning the dump frame actuator's first end 130 adjacentthe cab 118.

Alternatively, the cross member 114 can be more centrally locatedrelative to the dump frame 104. Or, for example, the cross member 114can be located closer to the rear end portions 120 than the front endportions 116 of the dump frame longitudinal members 110. In yet otherembodiments, the dump frame 104 can include more than one cross memberbetween the front and rear end portions 116 and 120.

With further reference to FIGS. 9 and 10, the slide frame 108 has agenerally rectangular shape. The slide frame 108 includes a pair oflongitudinal members or slide rails 142 disposed at least partiallyoutside the dump frame 104. As shown in FIG. 22, each longitudinalmember 142 includes a generally U-shaped or C-shaped channel 144 withsliding surfaces 143. Alternatively, other embodiments include a slideframe having differently configured longitudinal members that definechannels other than U-shaped or C-shaped. In the illustrated embodiment,the slide rails 142 are made from steel I-beams. Alternativeembodiments, however, include slide rails made from other suitablematerials (e.g., aluminum, stainless steel, etc.) and shapes such asC-channels, among other suitable configurations including customfabricated shapes.

Each engagement portion 146 has a generally rectangular shape with aside 148 attached to the corresponding longitudinal member 110 of thedump frame 104. Each engagement portion 146 also includes three othersides or surfaces 150 that are received within the channel 144.Alternatively, the engagement portions 146 can be configured in othersuitable shapes depending, for example, on the particular application.

In the particular illustrated embodiment of FIG. 22, bearing material152 is removably attached to the dump frame surfaces 150 to providesliding surfaces 153 that mate with the sliding surfaces 143 of thelongitudinal members 142. The bearing material 152 is configured to makecontact with the sliding surfaces 143 along substantially the entirelength of the sliding surfaces 143 to inhibit foreign objects and debrisfrom contacting the sliding surfaces 143 and 153. Applied in thismanner, the bearing material 152 provides a replaceable wear pad thatsubstantially seals the sliding surfaces 143 and 153 of the apparatus100. For the embodiment shown in FIG. 22, the bearing material 152 isremovably attached to the dump frame 104. Alternative embodimentsinclude bearing material that is removably or fixedly attached withinthe slide frame channel. In such embodiments, the sliding surfacesinclude the surface(s) of the bearing material and the dump frame thatslidably contact one another as the slide frame slides relative to thedump frame.

Additional alternative embodiments include a dump frame having a channel(e.g., U-shaped channel, C-shaped channel, among other channel shapes,etc.), and a slide frame having a generally rectangular portion (orother suitably shaped portion) that is received within the dump framechannel. Bearing material may be removably or fixedly attached withinthe dump frame channel, and/or bearing material removably or fixedlyattached to the slide frame surfaces. Other embodiments, however, do notinclude bearing material within either the dump frame channel orattached to the slide frame surfaces.

With continued reference to FIG. 22, the bearing material 152 isremovably attached to the dump frame 104 at surfaces 150 by screws 154.The screws 154 are recessed into the bearing material 152 such that thescrews do not contact or scrape against the sliding surfaces 143defining the slide frame channel 144.

Alternatively, a wide range of other suitable attachment means can beused for removably attaching the bearing material 152 to the dump frame104. For example, other embodiments include bearing material that isremovably attached by adhesive, rivets, clamps, snap fit, or any othersuitable means. In addition, the illustrated bearing material 152 has atwo-piece construction including an upper portion and a lower portion.Alternatively, other embodiments include bearing material having asingle-piece or monolithic construction (e.g., bearing material 852 inFIG. 35), and/or a multi-piece construction (e.g., three-piececonstruction, etc). Instead of, or in addition, to the bearing material152 removably attached to the dump frame, alternative embodimentsinclude bearing material that is removably or fixedly attached to theslide frame. In such embodiments, this bearing material can be disposedwithin the channel along the slide frame surfaces defining the channel.

In various embodiments, the bearing material 152 is disposed along theentire longitudinal length (or at least substantially the entirelongitudinal length) of the dump frame surfaces 150. With the bearingmaterial 152 disposed longitudinally along the sliding surface 153, thebearing material 152 substantially seals the sliding surfaces 143 and153 and inhibits foreign objects and debris, such as dirt, dust, grime,sand, grit, and other abrasive particles, from contacting the slidingsurfaces 143 and 153. Accordingly, the bearing material 152, applied inthis manner, can help keep the sliding surfaces 143 and 153 in arelatively clean condition. This, in turn, can advantageously provide amore aesthetically pleasing mechanism while also prolonging the usefullife of the sliding surfaces 143 and 153. In the illustrated embodimentof FIG. 22, the bearing material 152 has a width about equal to thewidth of the slide frame surfaces 143 such that the bearing material 152entirely covers (or at least substantially entirely covers) the slideframe surfaces 143. In other embodiments, however, the bearing material152 can have a width less than or greater than the width of the slideframe surfaces 143 depending on the particular application. For example,another embodiment includes a generally continuous strip of bearingmaterial that is narrower than the slide frame surface along which thebearing material is longitudinally disposed.

In addition to this advantageous sealing effect, the bearing material152 also reduces the friction associated with the relative slidingmovement between the dump frame 104 and the slide frame 108. In otherwords, there is less friction as the sliding surfaces 143 of the slideframe channel 144 slide relative to the sliding surfaces 153 of thebearing material 152 as compared to those embodiments in which there isno bearing material such that the dump frame directly contacts the slideframe as the slide frame slides relative to the dump frame.

By having bearing material 152 disposed along the entire length (or atleast substantially the entire length) of the dump frame surfaces 150,the load is better distributed along the entire length of the bearingmaterial 152 such that a lubricant (e.g., grease, etc.) may not benecessary. And, without such grease or other lubricant, the apparatus100 can remain a lot cleaner because there will be no grease or otherlubricant to which dust and other particulates can adhere andaccumulate. This, in turn, can prolong the useful life of the slidingsurfaces 143 and 153. Also, should any dirt or other particulates makecontact with the sliding surfaces 143 and 153, because there is nogrease present, the dirt can be easily washed or blown away afterextending the slide frame 108 to expose the sliding surfaces 143 and/or153.

These particular aspects of the invention relating to bearing materialsand full-length replaceable wear pads (as can all other aspects of theinvention) can be used individually or in combination with any one ormore of the other aspects (e.g., dump frame, slide frame,interchangeable attachments, sealing members, etc.) of the presentinvention.

In some embodiments, a lubricant can nevertheless be applied to thesliding surfaces 143 of the slide frame 104 and/or to the slidingsurfaces 153 of the bearing material 152 to reduce friction andfacilitate sliding of the bearing material's sliding surfaces 153 withinthe channels 144. For example, in embodiments that do not includebearing material or that include bearing material that is not disposedalong substantially the entire length of the sliding surface, alubricant may be at least partially disposed on at least one slidingsurface to improve the sliding movement of the slide frame relative tothe dump frame. But, in other embodiments, lubricant may not be neededgiven the friction-reducing effects of the bearing material 152.

The bearing material 152 can be a wide range of suitable materials, suchas various plastics. In one embodiment, the bearing material 152comprises an ultra-high molecular weight (UHMW) polyethylene materialthat is relatively long-wearing and inexpensive. Alternatively, othersuitable bearing materials include polymers such aspolytetrafluoroethylene (PTFE), nylon and acetal, metals such as bronze,and composite materials that may include graphite.

In addition (or as an alternative) to bearing material, variousembodiments include a seal that substantially covers and seals aninterface between sliding surfaces and/or between the dump frame and theslide frame. In this exemplary manner, the seal helps prevent foreignobjects and debris from entering the interface and contacting thesliding surfaces. For example, FIG. 31 illustrates an embodiment thatincludes both bearing material 452 and seal 456. In this particularillustrated embodiment, the seal 456 is a resilient member that isexternal to the channel 444. Alternatively, the seal 456 can be madefrom non-resilient materials, such as sheet metal. In addition, variousmeans can be employed to hold the seal 456 in place. By way of example,the seal 456 can be fastened to the slide frame member 442 using screws,adhesives, etc.

As shown in FIG. 31, the resilient member extends outwardly from theslide frame member 442 and at least partially across the top surface 438of the dump frame longitudinal member 410. Accordingly, the resilientmember substantially seals a top portion of an interface between thedump frame member 410 and slide frame member 442. Additionally, oralternatively, a resilient member can extend generally outwardly fromthe slide frame member and at least partially under the bottom surfaceof the dump frame longitudinal member, thereby substantially sealing abottom portion of an interface between the dump and slide frames. Inthese embodiments, the bearing material 452 and seal 456 cooperate toprovide an effective seal that inhibits foreign objects and debris fromcontacting the sliding surfaces 443 and 453. Other embodiments, however,do not include bearing material, in which case, the seal 456 can stillprovide a sufficient seal for inhibiting foreign objects and debris fromentering an interface and contacting the sliding surfaces.

As another example, FIG. 32 illustrates an embodiment in which a seal556 is at least partially formed by a portion 558 of the slide framelongitudinal member 542. As shown in FIG. 32, the portion 558 extendsover at least a portion of the top surface 538 of the dump framelongitudinal member 510, thereby substantially sealing a top portion ofan interface between the dump frame longitudinal member 510 and theslide frame longitudinal member 542. Additionally, or alternatively, aseal can also be at least partially formed by a portion of the slideframe longitudinal member 542 that extends under at least a portion ofthe bottom surface of the dump frame longitudinal member 510, therebysubstantially sealing a bottom portion of an interface between themembers 510 and 542. In these embodiments, the bearing material 552 andthe slide frame longitudinal member 542 cooperate to provide aneffective seal that inhibits foreign objects and debris from contactingthe sliding surfaces 543 and 553. Other embodiments, however, do notinclude bearing material, in which case, the slide frame longitudinalmember 542 can still provide a sufficient seal for inhibiting foreignobjects and debris from contacting the sliding surfaces.

Referring back to FIGS. 1 through 10, the apparatus 100 further includesat least one slide frame actuator for causing sliding movement of theslide frame 108. In the illustrated embodiment, the at least one slideframe actuator comprises two hydraulic actuator cylinders 160. In otherembodiments, however, the slide frame actuators can be pneumaticactuators, electrically-operated actuators, telescoping actuators,non-cylindrical actuators, etc.

While two slide frame actuators 160 are shown in the figures, anysuitable number of (i.e., one or more) slide frame actuators can be usedfor providing the actuation power for causing sliding movement of theslide frame depending, for example, on the particular application. Inaddition, the hoses for connecting the slide frame actuators 160 totheir power source have been removed for clarity.

In various embodiments, the slide frame actuators 160 receive power froma hydraulic pump mounted on the vehicle's engine. In another embodiment,the slide frame actuators 160 receive power from a self-containedstandalone electrically driven hydraulic power unit, which may, forexample, be contained within the space (generally indicated by arrow 129in FIG. 1) defined by the vehicle's chassis 106 or at other suitablelocations. Alternatively, other suitable means can be employed forproviding power to the slide frame actuators 160. For example, the slideframe actuators may receive hydraulic power generated by a hydraulicpump driven off of the truck's transmission. Or, for example, a widerange of non-hydraulic power sources (e.g., electric motors incombination with gear drives, screw drives, cables and pulleys, chainsand sprockets, etc.) may be used for causing the sliding movement. Inaddition, each slide frame actuator 160 does not need to receive itspower from the same source as the other slide frame actuator and/or asthe dump frame actuator 128.

As shown in FIG. 9, each slide frame actuator 160 is a hydrauliccylinder with a first end 162 connected to one of the dump framelongitudinal members 110, and a second end 164 connected to a crossmember 166 of the slide frame 108. In the illustrated embodiment, thefirst end 162 generally refers to the base end of the correspondinghydraulic cylinder 160. The second end 164 generally refers to the endof the shaft or rod, which, in turn, is engaged with a piston (notshown) within the corresponding hydraulic cylinder 160. In otherembodiments, however, the orientation of either or both of the slideframe actuators 160 may be reversed with the base end(s) pivotablymounted to the cross member 166, and the rod end(s) pivotably mounted tothe dump frame longitudinal member(s) 110. Alternatively, other types ofactuators (e.g., non-hydraulic actuators, pneumatic actuators,electrical actuators, non-cylindrical actuators, telescoping actuators,etc.) can also be employed with their first and second ends respectivelycoupled to the cross member 166 and dump frame longitudinal members 110,or vice versa.

Each slide frame actuator 160 is disposed along a substantial length ofthe dump frame longitudinal members 110, which allows the slide frameactuators 160 to have a relatively large stroke length. In addition,having the slide frame actuators 160 disposed on opposite sides of theslide frame 108 imparts a more well-balanced sliding movement to theslide frame 108.

Each slide frame actuator 160 is mounted to the dump frame 104 through acoupling member 168. Each coupling member 168 extends inwardly andtransversely from a respective one of the longitudinal members 110. Thecoupling members 168 are longitudinally disposed between the front endportions 116 of the longitudinal members 110 and the middle cross member114.

As shown in FIGS. 2 and 21, each slide frame actuator 160 extendsrearwardly from the coupling member 168, through an opening 170 (FIG.21) in the middle cross member 114 of the dump frame 104, and to therear cross member 166 of the slide frame 108. In the illustratedembodiment, the openings 170 are generally rectangular through-holesdefined by the cross member 114. Alternatively, however, other suitablyconfigured openings beside rectangular through-holes may be employedincluding circular through-holes, other non-rectangular through-holes,notches, cutouts, etc.

When the slide frame actuators 160 are actuated, the slide frameactuators 160 push against the slide frame's rear cross member 166 withsufficient force to cause the slide frame 108 to slide on the dump frame104 rearwardly away from the truck's cab 118, as shown by comparing FIG.9 with FIG. 10.

The slide frame actuators 160 are located within the width of thechassis 106 and within the width of the dump frame 104. Alternativeembodiments, however, include the slide frame actuators being locatedoutside the width of the chassis. For example, FIG. 33 illustrates analternative embodiment 600 in which the dump frame actuator 628 islocated within the width of the vehicle chassis, but the slide frameactuators 660 are located outside the width of the vehicle chassis. Eachslide frame actuator 660 has a first end 662 connected to one of thedump frame longitudinal members 610, and a second end 664 connected toone of the slide frame longitudinal members 642. Each slide frameactuator 660 is disposed along a substantial length of the dump framelongitudinal members 610. But in this particular embodiment, the slideframe actuators 660 are located outside the dump frame longitudinalmembers 610.

Referring to FIGS. 21 and 22, the slide frame longitudinal members 142include a top surface 172 and a bottom surface 174 which define a heighttherebetween. The first and second ends 162 and 164 of each slide frameactuator 160 are vertically disposed at least partially within theheight defined between the slide frame's top and bottom surfaces 172 and174. The slide frame actuators 160 are also vertically disposed at leastpartially within the height defined between the dump frame's top andbottom surfaces 138 and 140. With this arrangement, the slide frameactuators 160 do not add (or add very little) to the overall height ofthe apparatus 100. Accordingly, this arrangement helps provide theapparatus 100 with a relatively compact and low profile structure.

Moreover, and as shown in FIG. 22, the second end 134 of the dump frameactuator 128 is also vertically disposed within the height definedbetween the slide frame's top and bottom surfaces 172 and 174. Inaddition, the dump frame actuator 128 and the slide frame actuators 160are at least partially located in a plane that is substantially parallelto the slide plane of the slide frame 108. At least a portion of thedump frame actuator 128 and at least a portion of each slide frameactuator 160 are located in the same plane, which, in turn, issubstantially parallel to a plane through which at least a portion ofthe slide frame 108 slides. Accordingly, the dump frame actuator 128also does not add (or adds very little) to the overall height of theapparatus 100, thus helping to keep the size of the apparatus 100relatively compact and low profile.

As shown in FIG. 1, the chassis 106 can also include a filler strip 176for providing a substantially flat surface for supporting the slideframe 108. The filler strip 176 further provides a flush appearance thatadds to the aesthetic appearance of the truck 102. Depending on theparticular material from which the filler strip 176 is formed, thefiller strip 176 can also operate as a shock absorber. In oneembodiment, the filler strip 176 is formed from a hard wood such as oak.Alternatively, a wide range of other materials can be used for thefiller strip 176 including various plastics, hard rubber, or compositematerials.

With reference now to FIGS. 11 through 20, a load-carrying platform canbe removably attached (e.g., bolted, etc.) onto the slide frame 108. Inthe illustrated embodiment, the load-carrying platform comprises a bed178 that is bolted to the upper portion of the slide frame'slongitudinal members 142. The bed 178, however, is shown for purposes ofillustration only and not for purposes of limitation as a wide range ofother suitable load-carrying platforms can also be employed. In additionto load-carrying platforms, a wide range of other interchangeableattachments can also be provided each of which is removably attachableto the slide frame 108. This can further enhance the functionality andutility of the truck 102 having the apparatus 100. Exemplaryload-carrying attachments that can be attached to the apparatus 100include a boom, a fork lift attachment, an attachment (e.g., hook,pointed rod, etc.) for picking up hay bales, etc.

These particular aspects of the invention relating to interchangeableattachments (as can all other aspects of the invention) can be usedindividually or in combination with any one or more of the other aspects(e.g., dump frame, slide frame, sealing members, full-length replaceablewear pads, etc.) of the present invention.

As shown by comparing FIG. 11 with FIG. 14, the bed 178 is movable alongwith the slide frame 108. The bed 178 includes a tailgate 180. Thetailgate 180 when opened (FIG. 16) allows easier ground access to thebed 178. But when the tailgate 180 is closed (FIG. 11), the tailgate 180helps retain a load within the bed 178.

As shown in FIGS. 20 through 22, the bed 178 is supported by the slideframe 108 and the chassis 106 without the dump frame 104 having tosupport the bed 178 or the load carried by the bed 178 when theapparatus 100 is in the transport position. A clearance or gap 182(FIGS. 21 and 22) separates the top surface 138 of the dump frame 104from the bed cross member 184. The bed cross member 184 is supported onthe top surface 172 of the slide frame 108, which, in turn, is supportedby the chassis 106 through filler strip 176.

As shown in FIG. 23, the bed 178 includes a winch 186 to facilitateloading and unloading of a load (e.g., cargo, goods, motorcycle,four-wheel all terrain vehicle, riding lawn mower, etc.) onto/off thebed 178. The winch 186 is preferably attached so that it may be removedfrom the bed 178 when the winch 186 is not in use. As shown in FIGS. 20and 21, a receiver 187 is provided at the front of the bed 178 alongwith an electrical power outlet for the winch 186. The receiver 187 canbe similar to the truck's tow hitch receiver 189 (FIG. 19). The truckmay also be similarly equipped to mount the winch 186 in a tow hitchreceiver 189 at the rear and/or front of the vehicle. Also, in thoseembodiments in which both the slide and dump mechanisms are containedwithin the chassis 106, there is provided useable space on the outsideof the chassis 106 below the bed 178 for tool boxes or storage boxes,among other items. For example, one such storage box can be used forstoring the winch 186 when the winch 186 is not being used.

In addition, the bed 178 also includes slidable portions 188 that arepositioned adjacent an openable portion of a rear window of the cab 118.The portions 188 can be opened (FIG. 19) by slidably moving the portions188 away from one another, for example, to allow a person within the cab118 to access the bed 178 through the cab's rear window. The portions188 can be closed (FIG. 20) by slidably moving the portions 188 towardsone another, for example, to help protect the cab's rear window from aload within the bed 178.

The apparatus 100 can be positioned in various positions, including butnot limited to a transport position (FIG. 3), an intermediate dumpposition (FIG. 4), a dump position (FIG. 5), a slidably extendedposition (FIG. 6), an intermediate load/dump position (FIG. 7), and aload position (FIG. 8). The apparatus 100 can also be configured forpivotal movement to dumping angles greater than what is shown in thefigures depending, for example, on the particular application. Inaddition, the sliding movement can occur before, after, or during thepivoting movement depending on the particular operation for which theapparatus 100 is being used.

To allow an operator to selectively move the apparatus 100 into aparticular position, a wide range of switching mechanisms may beemployed. In the illustrated embodiment, a switching device 190 (FIG. 3)is externally mounted to the chassis 106 on the driver side of the truck102. A switching device can also or instead be mounted on the passengerside of the truck 102. In various embodiments, the external switchingdevice does not include an on/off power switch, but instead this on/offswitching is controlled by a switching device within the cab. Theswitching device may be electrical, hydraulic, or any other type orcombination thereof depending on the type of actuators and type of powerused.

As shown in FIG. 3, the switching device 190 includes three switches: aswitch for switchably controlling the sliding movement, a switch forswitchably controlling the pivoting movement, and a switch forswitchably controlling an attachment such as the winch 186.Alternatively, the switching device 190 can include more or lessswitches in any other suitable configuration. Additionally, oralternatively, a switching device may also be provided within the cab118 to allow a person within the cab 118 to control operation of theapparatus 100. As yet another example, the apparatus 100 canadditionally or alternatively be configured such that its operation canbe remotely controlled by an external transmitter or remote controldevice. In such embodiment, the apparatus 100 can be operativelyassociated with a controller capable of receiving signals from a remotecontrol device (e.g., wireless signals communicated between antennae,electromagnetic wave energy, cellular phone, RF energy or radiotransmissions, infrared, etc.). Signals received by the controller canthen provide information to the controller for causing the controller toselectively operate the dump frame actuator 128 and slide frameactuators 160 in accordance with the particular selection made by theoperator.

In various embodiments, the apparatus 100 is configured to be boltedonto the truck chassis 106. With this bolting arrangement, embodimentsof the apparatus 100 can be readily retrofit onto existing trucks ofvarious sizes and types.

FIGS. 24A and 24B illustrate another embodiment of bed 278 that can beused with an apparatus 200 of the present invention. In this particularembodiment, the bed 278 includes a support 291 on each of the passengerand driver sides of the bed 278. These supports 291 can be extended tohelp support the bed 278 for removal from, and attachment to the truck202. As shown in FIG. 24A, a pair of supports 292 can be positionedunder a rear end portion of the bed 278, and the supports 291 can beextended. As shown in FIG. 24B, the bed 278 can then be detached fromthe slide frame 208. At which point, the truck 202 can be driven awaywithout the bed 278 as the bed 278 remains supported by the supports 291and 292. In various embodiments, the supports may include one or morewheels for rolling on the ground. In such embodiments, the wheeledsupports can help support the bed, for example, to facilitate moving thebed when it is detached from the truck. In yet other embodiments, thesupports may be separate components that are not fastened to the bed. Asdescribed above, a wide range of interchangeable attachments (e.g., aboom, a fork lift attachment, an attachment for picking up hay bales,etc.) can be provided each of which is removably attachable to the slideframe. Any of the attachments can also include supports that can beextended to help support the interchangeable attachment for removalfrom, and engagement to the truck.

FIGS. 25 through 30 illustrate another embodiment of an apparatus 300 inwhich the actuation power for causing pivotal movement is provided by adump frame actuator 328 coupled to a linkage or scissors 394. Thecombination of a dump frame actuator and scissors is commonly referredto as a scissors hoist.

In the illustrated embodiment, the dump frame actuator 328 is anon-telescoping hydraulic cylinder. In other embodiments, however, thedump frame actuator 328 can be a pneumatic actuator, an electricalactuator, a non-cylindrical actuator, a telescoping actuator, amongother suitable actuation devices.

While only one dump frame actuator 328 is shown in FIGS. 25 through 30,alternative embodiments include a plurality of dump frame actuators thatcooperate to provide the actuation power for pivotably moving the dumpframe relative to the chassis. In addition, the hoses for connecting thedump frame actuator 328 to its power source have been removed forclarity.

In various embodiments, the dump frame actuator 328 receives power froma hydraulic pump mounted on the vehicle's engine. In another embodiment,the dump frame actuator 328 receives its power from a self-containedstandalone electrically driven hydraulic power unit, which may, forexample, be contained within a space (generally indicated by arrow 329in FIGS. 25 and 28) defined by the vehicle's chassis 306 or at othersuitable locations. Alternatively, other suitable means can be employedfor providing power to the dump frame actuator 328. For example, thedump frame actuator 328 may receive hydraulic power generated by ahydraulic pump driven off of the truck's transmission. Or, for example,a wide range of non-hydraulic power sources (e.g., electric motors incombination with gear drives, screw drives, cables and pulleys, chainsand sprockets, etc.) may be used for causing the dumping pivotalmovement.

As shown in FIG. 29, the dump frame actuator 328 is a non-telescopinghydraulic cylinder with a first end 330 pivotably coupled to the truckchassis 306, and a second end 334 pivotably coupled to a member 396 ofthe scissors 394. In the illustrated embodiment, the first end 330generally refers to the base end of the hydraulic cylinder 328. Thesecond end 334 generally refers to the end of the shaft or rod, which,in turn, is engaged with a piston (not shown) within the hydrauliccylinder 328. In other embodiments, however, the first and second ends330 and 334 may be reversed such that the base end of the actuatorcylinder is pivotably coupled to the scissors, and the rod end ispivotably coupled to the vehicle chassis. Yet other embodiments includea dump frame actuator that is not directly connected to the scissors,but instead the dump frame actuator is connected to the dump frame at adifferent location than the location at which the scissors is connectedto the dump frame. In still further embodiments, other types ofactuators (e.g., non-hydraulic actuators, pneumatic actuators,electrical actuators, non-cylindrical actuators, telescoping actuators,etc.) can be employed with their first and second ends coupled to thescissors and chassis (or vice versa) or coupled to the dump frame andchassis (or vice versa).

With reference to FIG. 25, the scissors 394 includes an end portion 398coupled to the dump frame cross member 314. In this embodiment, thepivoting force applied to the dump frame cross member 314 is distributedat least partially along the width of the dump frame cross member 314.This, in turn, provides well-balanced and stable pivoting movement tothe apparatus 300. In the illustrated embodiment, the dump frame 304includes a front cross member 312 that enhances rigidity of the dumpframe 304. But the front cross member 312 is not necessary for and maybe eliminated in some embodiments, such as when the load for causingpivotal movement of the dump frame is more evenly distributed or spreadout relative to the longitudinal dump frame members.

FIGS. 34 and 35 illustrate alternative cross-sectional shapes that canbe used for dump frame longitudinal members 710, 810 and slide framelongitudinal members 742, 842. As shown in FIG. 34, the dump framelongitudinal member 710 is vertically disposed entirely within theheight defined between the slide frame member's top and bottom surfaces772 and 774. FIG. 34 does not show bearing material disposed along thesliding surfaces (which in the particular illustrated embodiment includethree outer surfaces 753 of the dump frame longitudinal member 710 andthe inner surfaces 743 defining the slide frame channel 744).Alternative embodiments, however, include bearing material disposed atleast partially along one or more sliding surfaces.

As shown in FIG. 35, the dump frame longitudinal member 810 isvertically disposed entirely within the height defined between the topand bottom surfaces 872 and 874 of the slide frame longitudinal member842. In addition, bearing material 852 is disposed along the slidingsurfaces (which in the particular illustrated embodiment include theouter surfaces 853 of the bearing material 852 and the inner surfaces843 defining the slide frame channel 844). In this particularembodiment, the bearing material 852 has a single-piece or monolithicconstruction, although other embodiments include a bearing materialhaving a multi-piece construction (e.g., two-piece construction,three-piece construction, etc). The bearing material 852 seals thesliding surfaces 843 and 853 and inhibits foreign objects and debrisfrom contacting the sliding surfaces 843 and 853. In addition, thebearing material 852 also reduces friction between the sliding surfaces843 and 853.

FIGS. 36 and 37 illustrate another embodiment of an apparatus 900 thatcan be used with a vehicle 902 for dumping and providing ground access.As shown, the apparatus 900 includes a dump frame 904 pivotably coupledto the truck's chassis 906. The dump frame 904 includes a pair oflongitudinal members 910, a front cross member 912, and an intermediatecross member 914.

The apparatus 900 also includes a slide frame 908 slidably coupled tothe dump frame 904. The slide frame 908 includes a pair of longitudinalmembers or slide rails 942 disposed at least partially outside the dumpframe 904.

In this particular embodiment, the dump frame longitudinal members 910are vertically disposed entirely within the height defined between thetop and bottom surfaces 972 (FIG. 36) and 974 (FIG. 37) of the slideframe longitudinal members 942. In addition, this particular embodimentdoes not include bearing material disposed along the sliding surfaces.But alternative embodiments include bearing material disposed at leastpartially along the sliding surfaces of the dump frame members 910.

Accordingly, various embodiments provide relatively compact andlow-profile mechanisms for dumping and providing ground clearance, forexample, to a bed of a pickup truck. In various embodiments, themechanism has such a low profile and is contained within the width ofthe truck's chassis that the mechanism is not readily apparent to acasual observer. In addition, various embodiments also include actuatorsthat are at least partially side-by-side and not stacked on top of eachother such that the resulting device is relatively low profile. Furtherembodiments also seal the sliding surfaces to inhibit foreign objectsand debris (e.g., dirt, dust, grime, sand, grit, other abrasiveparticles, etc.) from contacting the sliding surfaces. In someembodiments, the seal includes bearing material that also reducesfriction between the sliding surfaces without a lubricant therebetween.By sealing the sliding surfaces in this manner, the sliding surfaces canbe kept in a relatively clean condition, which, in turn, can provide amore aesthetically pleasing mechanism while also prolonging the usefullife of the sliding surfaces.

The teachings of the present invention can be applied to a wide range ofvehicles, including pickup trucks, other larger commercial-type trucks,trailers, and other vehicles having a chassis to which can be attachedload-carrying apparatus, such as load-carrying platforms and beds.Accordingly, the specific references to pickup trucks should not beconstrued as limiting the scope of the present invention to any specificform/type of vehicle.

The description of the invention is merely exemplary in nature and,thus, variations that do not depart from the gist of the invention areintended to be within the scope of the invention. Such variations arenot to be regarded as a departure from the spirit and scope of theinvention.

1. An apparatus for a vehicle having a chassis, the apparatus comprisinga dump frame pivotably coupled to the chassis for pivotal movementrelative to the chassis, a slide frame for supporting a load, the slideframe slidably coupled to the dump frame such that the slide frame islongitudinally slidable relative to the dump frame, and such that theslide frame pivots along with the dump frame relative to the chassis,the dump frame including a longitudinal engagement portion having alength, the slide frame including a longitudinal channel for receivingthe engagement portion of the dump frame, and a bearing materialdisposed along substantially the entire length of the engagementportion, the bearing material reducing friction associated with theengagement portion relatively sliding within the channel, wherein theengagement portion includes a generally rectangular beam having threesides within the longitudinal channel, and wherein the bearing materialis disposed along substantially the entire length of at least two ofsaid three sides of the engagement portion.
 2. The apparatus of claim 1,wherein the bearing material is disposed along the entire length of eachof the at least two of said three sides of the engagement portion. 3.The apparatus of claim 1, further comprising a lubricant at leastpartially disposed along at least one sliding surface of the apparatus.4. The apparatus of claim 1, wherein the bearing material is removablyattached to the dump frame.
 5. An apparatus for a vehicle having achassis, the apparatus comprising a dump frame pivotably coupled to thechassis for pivotal movement relative to the chassis, a slide frame forsupporting a load, the slide frame slidably coupled to the dump framesuch that the slide frame is longitudinally slidable relative to thedump frame, and such that the slide frame pivots along with the dumpframe relative to the chassis, the dump frame including a longitudinalengagement portion having a length, the slide frame including alongitudinal channel for receiving the engagement portion of the dumpframe, and a bearing material disposed along substantially the entirelength of the engagement portion, the bearing material reducing frictionassociated with the engagement portion relatively sliding within thechannel, wherein the engagement portion includes a generally rectangularbeam having three sides within the longitudinal channel, and wherein thebearing material is disposed along substantially the entire length ofeach of said three sides of the engagement portion.
 6. The apparatus ofclaim 1, further comprising at least one seal external to thelongitudinal channel for substantially sealing at least one interfacebetween the slide frame and the dump frame to thereby inhibit theingress of foreign objects and debris into the longitudinal channelalong the at least one interface.
 7. A vehicle comprising the apparatusof claim
 1. 8. An apparatus for a vehicle having a chassis, theapparatus comprising a dump frame pivotably coupled to the chassis forpivotal movement relative to the chassis, a slide frame for supporting aload, the slide frame slidably coupled to the dump frame such that theslide frame is longitudinally slidable relative to the dump frame, andsuch that the slide frame pivots along with the dump frame relative tothe chassis, the dump frame including a longitudinal engagement portionhaving a length, the slide frame including a longitudinal channel forreceiving the engagement portion of the dump frame, and a bearingmaterial disposed along substantially the entire length of theengagement portion, the bearing material reducing friction associatedwith the engagement portion relatively sliding within the channel, thebearing material configured to make contact with and substantially sealat least one sliding surface along substantially the entire length ofthe at least one sliding surface to thereby inhibit foreign objects anddebris from contacting the at least one sliding surface, wherein theengagement portion includes a generally rectangular beam having threesides within the longitudinal channel, and wherein the bearing materialis disposed along substantially the entire length of at least two ofsaid three sides of the engagement portion.
 9. The apparatus of claim 8,wherein the bearing material is disposed along the entire length of eachof the at least two of said three sides of the engagement portion. 10.The apparatus of claim 8, further comprising a lubricant at leastpartially disposed along at least one sliding surface of the apparatus.11. The apparatus of claim 8, wherein the bearing material is removablyattached to the dump frame.
 12. An apparatus for a vehicle having achassis, the apparatus comprising a dump frame pivotably coupled to thechassis for pivotal movement relative to the chassis, a slide frame forsupporting a load, the slide frame slidably coupled to the dump framesuch that the slide frame is longitudinally slidable relative to thedump frame, and such that the slide frame pivots along with the dumpframe relative to the chassis, the dump frame including a longitudinalengagement portion having a length, the slide frame including alongitudinal channel for receiving the engagement portion of the dumpframe, and a bearing material disposed along substantially the entirelength of the engagement portion, the bearing material reducing frictionassociated with the engagement portion relatively sliding within thechannel, the bearing material configured to make contact with andsubstantially seal at least one sliding surface along substantially theentire length of the at least one sliding surface to thereby inhibitforeign objects and debris from contacting the at least one slidingsurface, wherein the engagement portion includes a generally rectangularbeam having three sides within the longitudinal channel, and wherein thebearing material is disposed along substantially the entire length ofeach of said three sides of the engagement portion.
 13. The apparatus ofclaim 8, further comprising at least one seal external to thelongitudinal channel for substantially sealing at least one interfacebetween the slide frame and the dump frame to thereby inhibit theingress of foreign objects and debris into the longitudinal channelalong the at least one interface.
 14. A vehicle comprising the apparatusof claim
 8. 15. The apparatus of claim 1, wherein the bearing materialhas a single-piece construction.
 16. The apparatus of claim 1, whereinsurfaces of the slide frame defining the longitudinal channel arecovered by the bearing material.
 17. The apparatus of claim 1, whereinat least a portion of the longitudinal channel of the slide frame isgenerally C-shaped.
 18. The apparatus of claim 8, wherein the bearingmaterial has a single-piece construction.
 19. The apparatus of claim 8,wherein surfaces of the slide frame defining the longitudinal channelare covered by the bearing material.
 20. The apparatus of claim 8,wherein at least a portion of the longitudinal channel of the slideframe is generally C-shaped.